I know his gear is slightly better (I also still had a 530 Ring in those logs), he also has a little over 1200 extra Haste, Mastery and Crit and he also has four set. But are those small differences in gear really worth 40k extra DPS alone or is he just way better than I am?

I was even running DoC on that fight just to try and keep above 300k. He is running HoTW and doing 340k.

One of the noticable things in the logs is that he had 9 Rentaki procs resulting in 33% uptime, where as I only had 4 Harroms procs, resulting in 15% uptime. Multistrike from Harroms also did 4.5% of my damage. At this point, looking at how valuable the extra Mastery/Haste/Crit from Rentakis passive expertise reforged away, I'm actually considering going back, particularly if the uptime is double Harroms.

Anyway, I'd love for you guys to offer feedback on how exactly the difference in DPS was so significant. I'm not that great at picking apart logs, fortunately you guys are!